To play in split-screen do the following:
- Once all the controllers* are connected, launch the game
- While in the Main Menu, Player 2 needs to press:
DualShock 4 Controller Options button
Xbox One Controller Menu button
Steam Controller Start button - Player 2 will then join the party and you can play any Offline or Online mode together
Note: On PC, in order to play Split-Screen you need two controllers. Keyboard/Mouse + controller is not officially supported.